Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b9a9d44c344512…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 11:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb2ea7deb5d31b13523e53e691d3a9ca SHA-1: 65a2f72038fed4ba81871312ab38fbb9f35c2a94 SHA-256: 85b9a9d44c34451217443a34e2e8872e1efc52209172363b48803f7739c42d62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.2214

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=winky+face+emoji+text PDF link annotation
    • http://zoltysnieg.pl/pliki_wyswig/files/jexowokevamuru.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/36567132100.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/nowosukibiledunazi.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/vagax.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/bonevirobegolowuxuxe.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d31f40400---19356504487.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7ad6d1119469bd86fa33e6f820626817/konifoxotigavixibiseke.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c967935e36a---tobotaromaseleno.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc518d77a7---giwulotinixibabelave.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c45c98535---29616001577.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607870791422b---47041531742.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fikekinibabotuk.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c13ae6299a0---boxerupepevijekawuz.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca95da306c---74894898416.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de4a034427---sapefaxexiroj.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/pumomibepimofokaguxi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080c45481285---39582049908.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071a85db98d4---segejulimuginuwuraravatij.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f8150173---92507696652.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/48618120613.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/gulujegose.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1m5efpqttoulgjo7n04r74vqid/dafopadovukutuxafixore.pdfIn PDF document text
    • http://peak-experience-japan.com/75245811524.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efde4c723e---wixajexepijolonidabew.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 10616 bytes
SHA-256: fcbe6fcaddc3d2e3cdd855977afa219614786ebfa6f2d9cdfea30d4ba64d543d
font_02_sfnt_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 17620 bytes
SHA-256: 83836e81da7654a423914280e49dbdb6c4157643c618e2a3b0aafda094ad5ab4